Superiority of magnetic resonant coupling at large air gap in wireless power transfer

The differences between electromagnetic induction and magnetic resonant coupling were presented in the first study on electromagnetic resonant coupling. However, there is no clear technical comparison between the two phenomena. Therefore, in this study, four circuits are compared. The transition from typical electromagnetic induction to magnetic resonant coupling is demonstrated. The superiority for a high efficiency and high power transfer across a large air gap and displacement is discussed, where the primary and secondary resonant frequencies are the same. From the discussions, the superiority of magnetic resonant coupling over the other topologies is proposed at large air gap and verified experimentally.

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